Early life. Hallyday was born in Boulogne-Billancourt and is the son of the French singers Sylvie Vartan and Johnny Hallyday.David Hallyday is a first cousin of actor Michael Vartan.. Career. Hallyday is most known for writing music for others, including a collaboration with his father on the 1999 album Sang pour sang.. He appeared in the teenage comedy He's My Girl (1987), also performing its ...